I vote LDAP also, work with it quite a bit, however you can spend quite a lot of time working out how to make it perform well. I could also see that you would have to make install real simple. Many people appear to have a problem getting to grips with the concept and hence how to setup / admin LDAP.

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Rod, UK Mk2 64gig Red S/N.341 Empeg 2xDigital Audio Receiver - one Wireless